diff --git a/libraries/AP_Common/AP_Common.h b/libraries/AP_Common/AP_Common.h
index 43a6de133f..e06a5b99e1 100644
--- a/libraries/AP_Common/AP_Common.h
+++ b/libraries/AP_Common/AP_Common.h
@@ -127,14 +127,14 @@ static inline size_t strlcat_P(char *buffer, const prog_char_t *pstr, size_t buf
 /// @name	Types
 ///
 /// Data structures and types used throughout the libraries and applications. 0 = default
-/// bit 0: Altitude is stored 			0: Absolute,	1: Relative
-/// bit 1: Chnage Alt between WP 		0: Gradually,	1: ASAP
-/// bit 2: Yaw towards WP when flying 	0: No, 			1: Yes (for quads)
-/// bit 3:
-/// bit 4:
+/// bit 0: Altitude is stored 			    0: Absolute,	1: Relative
+/// bit 1: Chnage Alt between WP 		    0: Gradually,	1: ASAP
+/// bit 2: Yaw towards WP when flying 	    0: No, 			1: Yes (mostly for quads)
+/// bit 3: Req.to hit WP.alt to continue    0: No,          1: Yes
+/// bit 4: Relative to Home					0: No, 			1: Yes
 /// bit 5:
 /// bit 6:
-/// bit 7: Move to next Command 		0: YES, 		1: Loiter until commanded
+/// bit 7: Move to next Command 		    0: YES, 		1: Loiter until commanded
 
 //@{